1980966 has 32 divisors (see below), whose sum is σ = 4324320. Its totient is φ = 601344.

The previous prime is 1980949. The next prime is 1980983. The reversal of 1980966 is 6690891.

It is an interprime number because it is at equal distance from previous prime (1980949) and next prime (1980983).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a plaindrome in base 11.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8386 + ... + 8618.

It is an arithmetic number, because the mean of its divisors is an integer number (135135).

2^1980966 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1980966, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2162160).

1980966 is an abundant number, since it is smaller than the sum of its proper divisors (2343354).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1980966 is a wasteful number, since it uses less digits than its factorization.

1980966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 1980966 is about 1407.4679392441. The cubic root of 1980966 is about 125.5911413418.

The spelling of 1980966 in words is "one million, nine hundred eighty thousand, nine hundred sixty-six".